I have lots of cartos in that resistance range, the ProVari will work fine. Supposedly your batteries will drain faster, but I haven't noticed a difference. I thinks dem smart people who has meter 'n stuff measure it with those whatchacallit things, so theys can get in
fights debates in the really smart people's forums.
Me? I just vape 'til it blinks, then put in a fresh battery. If I lost 20 minutes, I would't know, as long as I have a bunch of batteries charged I don't pay attention to stuff like that.
I have so many things with lower resistances because I used a standard eGo for a long time. The low res was so I could switch devices and not have the eGo get sad and wimpy on me. Using higher res with ProVari gives you the ability to push more power, which is one reason you got it

and fine tune your vape even more.
With a 1.7Ω device, I usually start at 3.7 volts - which is roughly 8 watts - and then dial around for taste. I like a cooler vape, so most of the time that's too warm for me, but not always. I have a juice that tastes great at 9 watts, and another that tastes burnt over 7w.
Your baby will be fine.